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VOCs <br /> No VOCs were reported this quarter at any groundwater well. <br /> Surface Water <br /> Surface water was sampled on February 18, 2004. All concentrations of parameters, field <br /> measured and laboratory analyzed,were below the concentration limits determined by statistical <br /> analysis(Table 3). <br /> Soil Gas - Unsaturated Zone <br /> The soil gasses were sampled February 11 and 19, 2004(first quarter event)and May 6,2004 <br /> (second quarter event) (Figure 5). Samples were collected by first measuring the methane content <br /> using a Landtec Gem 1000 portable gas detector. The Gem was operated until a steady-state gas <br /> composition indicated that the well was purged. After purging, gas samples were collected in <br /> 6-liter Summa canisters and sent to Atmospheric Analysis and Consulting Laboratories for <br /> analysis by EPA method TO-14A. <br /> First Quarter Results <br /> VOCs were detected in all of the soil gas samples. The highest VOC concentration was found in <br /> SG-1,which is closest to the landfill(Table 4). A tabular summary of test results is included in <br /> Appendix H. <br /> Methane concentrations were 0 percent in all the wells and in the soil gas trench. <br /> Second Quarter Results <br /> VOCs were detected in all of the soil gas samples. Again,the highest VOC concentration was <br /> found in SG-1 (Table 5). The total number of VOCs reported in the eleven wells and trench was <br /> 87,which is fewer than the 104 reported the previous quarter. <br /> Methane concentrations were 0 percent in all the wells and in the soil gas trench except for in well <br /> SG-11 where the methane concentration was 7.1 percent. <br /> A sample of the ambient air was taken upwind of the landfill(wind speed approximately 20 mph). <br /> Four compounds were detected in this sample. <br /> Foothill Sanitary Landfill 7 Department of Public Works/Solid Waste <br /> 1ST Semester 2004 Groundwater Monitoring County of San Joaquin-July 27,2004 <br />